refactor(compliance-sdk): split client/provider/embed/state under 500 LOC

Phase 4 continuation. All touched files now under the file-size cap, and
drive-by fixes unblock the types/core/react/vanilla builds which were broken
at baseline.

Splits
- packages/types/src/state 505 -> 31 LOC barrel + state-flow/-assessment/-core
- packages/core/src/client 521 -> 395 LOC + client-http 187 LOC (HTTP transport)
- packages/react/src/provider 539 -> 460 LOC + provider-context 101 LOC
- packages/vanilla/src/embed 611 -> 290 LOC + embed-banner 321 + embed-translations 78

Drive-by fixes (pre-existing typecheck/build failures)
- types/rag.ts: rename colliding LegalDocument export to RagLegalDocument
  (the `export *` chain in index.ts was ambiguous; two consumers updated
  - core/modules/rag.ts drops unused import, vue/composables/useRAG.ts
  switches to the renamed symbol).
- core/modules/rag.ts: wrap client searchRAG response to add the missing
  `query` field so the declared SearchResponse return type is satisfied.
- react/provider.tsx: re-export useCompliance so ComplianceDashboard /
  ConsentBanner / DSRPortal legacy `from '../provider'` imports resolve.
- vanilla/embed.ts + web-components/base.ts: default tenantId to ''
  so ComplianceClient construction typechecks.
- vanilla/web-components/consent-banner.ts: tighten categories literal to
  `as const` so t.categories indexing narrows correctly.

Verification: packages/types + core + react + vanilla all `pnpm build`
clean with DTS emission. consent-sdk unaffected (still green).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

breakpilot-compliance-sdk/packages/vue/src/composables/useRAG.ts

@@ -8,7 +8,7 @@ import type {
   SearchResponse,
   AssistantResponse,
   ChatMessage,
-  LegalDocument,
+  RagLegalDocument,
 } from '@breakpilot/compliance-sdk-types'
 
 export interface UseRAGReturn {
@@ -23,7 +23,7 @@ export interface UseRAGReturn {
   isTyping: Ref<boolean>
 
   // Documents
-  documents: ComputedRef<LegalDocument[]>
+  documents: ComputedRef<RagLegalDocument[]>
   availableRegulations: ComputedRef<string[]>
 
   // Loading state